• Subject: PF File Definition questions...
  • From: Chuck Lewis <clewis@xxxxxxxxxx>
  • Date: Thu, 14 Oct 1999 14:59:42 +0100

Hi Folks !

Was wondering how folks define PF's when it comes to keyed or not.

Is there something I'm missing when it comes to NOT having the "most
common" field(s) in a PF defined in the PF a key field(s) ?

Then handle the less obvious stuff in LF's ?

One less access path...

Why PF's with NO key fields ?

Also, I was told YEARS ago (on the S/38) that you should try to keep the
number of LF's over a PF to a minimum, say 3, 4 tops and let your
program handle the level breaks, etc. to help system performance. Even
on the AS/400 there has GOT to be some truth to that just due to the
fact that there aren't a BUNCH of access paths that have to be rebuilt.
I've seen some vendor packages with a hundred LF's over one PF !!!!

Thanks !

Chuck

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